Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net income	$ 1,372us-gaap_ProfitLoss	$ 4,428us-gaap_ProfitLoss
Loss from discontinued operations	0	132
Income from continuing operations	1,372	4,560
Adjustments to reconcile to net cash provided by operating activities:
Depreciation and amortization	10,486us-gaap_DepreciationAndAmortization	10,849us-gaap_DepreciationAndAmortization
Gain on sale of fixed assets	(200)	160
Equity-based compensation expense	1,663us-gaap_ShareBasedCompensation	1,284us-gaap_ShareBasedCompensation
Deferred income taxes	(969)aegn_DeferredIncomeTaxExpenseCashFlows	553aegn_DeferredIncomeTaxExpenseCashFlows
Equity in earnings of affiliated companies	0	(677)
Non-cash restructuring charges	(1,359)	0
Loss on sale of Video Injection - Insituform SAS	2,864	0
Loss on sale of interests in Bayou Coating, L.L.C.	0	472
(Gain) loss on foreign currency transactions	216	(366)
Other	(394)us-gaap_OtherNoncashIncomeExpense	631us-gaap_OtherNoncashIncomeExpense
Changes in operating assets and liabilities (net of acquisitions):
Restricted cash	(1,093)	(130)
Return on equity of affiliated companies	0	684
Receivables net, retainage and costs and estimated earnings in excess of billings	(17,442)us-gaap_IncreaseDecreaseInReceivables	(9,005)us-gaap_IncreaseDecreaseInReceivables
Inventories	(3,455)us-gaap_IncreaseDecreaseInInventories	(340)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	2,379	829
Accounts payable and accrued expenses	(7,250)	(17,652)
Other operating	981	(781)
Net cash used in operating activities	(12,201)	(8,929)
Cash flows from investing activities:
Capital expenditures	(4,234)	(5,620)
Proceeds from sale of fixed assets	297	380
Patent expenditures	(7)	(677)
Purchase of Schultz Mechanical Contractors, Inc., net of cash acquired	(6,479)	0
Proceeds from sale of interests in Bayou Coating, L.L.C.	0	9,065
Payment to Fyfe Asia sellers for final net working capital	(1,098)	0
Net cash provided by (used in) investing activities	(11,521)	3,148
Cash flows from financing activities:
Proceeds from issuance of common stock upon stock option exercises, including tax effects	1,399	1,287
Repurchase of common stock	(7,622)	(5,475)
Purchase of non-controlling interest	0us-gaap_PaymentsToMinorityShareholders	(617)us-gaap_PaymentsToMinorityShareholders
Proceeds on notes payable	1,505us-gaap_ProceedsFromNotesPayable	0us-gaap_ProceedsFromNotesPayable
Proceeds from line of credit	26,000us-gaap_ProceedsFromLinesOfCredit	0us-gaap_ProceedsFromLinesOfCredit
Principal payments on long-term debt	(33,031)us-gaap_RepaymentsOfLongTermDebt	(4,539)us-gaap_RepaymentsOfLongTermDebt
Net cash used in financing activities	(11,749)	(9,344)
Effect of exchange rate changes on cash	(3,569)	818
Net decrease in cash and cash equivalents for the period	(39,040)	(14,307)
Cash and cash equivalents, beginning of period	174,965	158,045
Cash and cash equivalents, end of period	$ 135,925	$ 143,738

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- Definition

The cash outflow associated with a second acquisition of a business, net of the cash acquired from the purchase.

+ References

No definition available.

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- Definition

The cash outflow to acquire asset without physical form usually arising from contractual or other legal rights, excluding goodwill.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 13

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

Amount of cash outflow to a noncontrolling interest. Includes, but not limited to, reduction of noncontrolling interest ownership. Excludes dividends paid to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585

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- Definition

The cash inflow from the sale of an investment interest in a joint venture that the reporting entity has not previously accounted for using consolidation or the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 235

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.4-08.(f))

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 08

-Paragraph f

-Article 4

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3255-108585

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- Definition

The cash inflow from a borrowing supported by a written promise to pay an obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Investing Activities

-URI http://asc.fasb.org/extlink&oid=6516133

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 12

-Subparagraph (c)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585

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- Definition

The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4K

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591552-111686

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 45

-Paragraph 19

-URI http://asc.fasb.org/extlink&oid=7656940&loc=SL4569616-111683

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 810

-SubTopic 10

-Section 50

-Paragraph 1A

-Subparagraph (a),(c)

-URI http://asc.fasb.org/extlink&oid=18733093&loc=SL4573702-111684

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-Publisher FASB

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-Topic 810

-SubTopic 10

-Section 55

-Paragraph 4J

-URI http://asc.fasb.org/extlink&oid=35736750&loc=SL4591551-111686

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- Definition

The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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